First pass at a trmon command-line interface; fix a few bugs

First pass at a trmon command-line interface; fix a few bugs

At this point, if you hack tr_mons_auth_handler() to always return 0
(success), then trmon can connect to the trust router's monitoring port
and retrieve a test message. That counts as first contact, I guess.
Actual functionality is still to come.

  * Create basic trmon utility based closely on tidc
  * Temporarily use void pointers for trps/tids handles in the MON_INSTANCE
    structure - there is a header file cycle that prevents compliation.
    Need to sort that out, but this works for the moment.
  * Fill in tr_msg handlers for monitoring message encoders/decoders
  * Revert to the monitoring msg decoder working from json, not a string,
    since that is what we need. This breaks the test programs for now.